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APPENDIX B — CONTROL MODES WITH
Humidi−MiZer SYSTEM AND ECONOMIZER
Thermostat input shown for cooling demand (versus temperature
sensor and set point). Humidistat input shown for
dehumidification demand (versus relative humidity sensor and set
point). Economizer cooling availability is dependent on outdoor
temperature or enthalpy.
Circuit Subcooling mode = REHEAT 1
Circuit HGRH mode = hot gas reheat = REHEAT 2
Circuit ON mode = normal cooling
Thermostat Control type configuration = 0 = Adaptive, or Unit
Control Type configuration = 3 = Space Temperature, for
Dual-circuit and Tri-Circuit units results in added staging timers
and flex between 1-stage Y1 and 2-stage Y1.
SINGLE-CIRCUIT UNITS
(Thermostat Control Type configuration is ignored)
ECONO AVAILABLE? Y1 Y2 HUMIDISTAT CIRCUIT A ECONOMIZER
NO OFF OFF LOW OFF Min. Position (Econo closed if fan off)
NO OFF OFF HIGH HGRH Min. Position
NO ON OFF HIGH Subcooling Min. Position
NO OFF ON HIGH Subcooling Min. Position alarm T411: Y2 without Y1
NO ON ON HIGH Subcooling Min. Position no alarm
NO ON OFF LOW ON Min. Position
NO OFF ON LOW ON Min. Position alarm T411: Y2 without Y1
NO ON ON LOW ON Min. Position no alarm
YES OFF OFF LOW OFF Min. Position (Econo closed if fan off)
YES OFF OFF HIGH HGRH Min. Position
YES ON OFF HIGH Subcooling Min. Position
YES OFF ON HIGH Subcooling Min. Position alarm T411: Y2 without Y1
YES ON ON HIGH Subcooling Min. Position no alarm
YES ON OFF LOW OFF or ON Cooling
YES OFF ON LOW OFF or ON Cooling alarm T411: Y2 without Y1
YES ON ON LOW OFF or ON Cooling no alarm
DUAL CIRCUIT UNITS
1-Stage Y1 (Thermostat Control Type configuration = 1)
and 2-Stage Y1 (Thermostat Control Type configuration = 2)
ECONO AVAILABLE? Y1 Y2 HUMIDISTAT CIRCUIT A CIRCUIT B ECONOMIZER
NO OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
NO OFF OFF HIGH HGRH HGRH Min. Position
NO ON OFF HIGH Subcooling HGRH Min. Position
NO OFF ON HIGH Subcooling Subcooling Min. Position alarm T411: Y2 without Y1
NO ON ON HIGH Subcooling Subcooling Min. Position
NO ON OFF LOW ON OFF Min. Position
NO OFF ON LOW ON ON Min. Position alarm T411: Y2 without Y1
NO ON ON LOW ON ON Min. Position
YES OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
YES OFF OFF HIGH HGRH HGRH Min. Position
YES ON OFF HIGH Subcooling HGRH Min. Position
YES OFF ON HIGH Subcooling Subcooling Min. Position alarm T411: Y2 without Y1
YES ON ON HIGH Subcooling Subcooling Min. Position
YES ON OFF LOW OFF or ON OFF Cooling
YES OFF ON LOW OFF or ON OFF or ON Cooling alarm T411: Y2 without Y1
YES ON ON LOW OFF or ON OFF or ON Cooling
DUAL-CIRCUIT UNITS
Digital (Thermostat Control Type configuration = 3)
ECONO AVAILABLE? Y1 Y2 HUMIDISTAT CIRCUIT A CIRCUIT B ECONOMIZER
NO OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
NO OFF OFF HIGH HGRH OFF Min. Position
NO ON OFF HIGH HGRH HGRH Min. Position
NO OFF ON HIGH Subcooling HGRH Min. Position
NO ON ON HIGH Subcooling Subcooling Min. Position
NO ON OFF LOW ON OFF Min. Position
NO OFF ON LOW ON ON Min. Position
NO ON ON LOW ON ON Min. Position
YES OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
YES OFF OFF HIGH HGRH OFF Min. Position
YES ON OFF HIGH HGRH HGRH Min. Position
YES OFF ON HIGH Subcooling HGRH Min. Position
YES ON ON HIGH Subcooling Subcooling Min. Position
YES ON OFF LOW OFF or ON OFF Cooling
YES OFF ON LOW OFF or ON OFF or ON Cooling
YES ON ON LOW OFF or ON OFF or ON Cooling
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